Questions:
Linear equations
1. Find k if the following system of equations has a unique solution
2x + (k - 1)y = 6
3x + (2k + 1)y = 9
2. Find k if the following system of equations has infinite solutions
kx + 3y = k - 3
12x + ky = k
3. Find k if the following system of equations has no solution
3x + 2y = 6
kx + (k - 1)y = 9